# data = True
# print("开始")
# while data:
#     print("如果祖国遭受到侵犯，热血男儿当自强。")
# print("结束")
# data = 1
# while data <5:
#     print("此时data=",data)
#     data+=1
# flag=True
# while flag:
#     usr=input("请输入你的名字：")
#     pwd=input("请输入你的密码：")
#     if usr == "xiaofeng" and pwd=="123456":
#         print("登录成功！")
#         flag=False
#     else:
#         print("登录失败！")
# while True:
#     print("1")
#     break
#     print("2")
# print("开始")
# i=1
# while True:
#     i+=1
#     if i>10:
#         break
# print(i)
print('开始运行')
while True:
    usr=input("请输入用户名：")
    pwd = input("请输入密码：")
    if usr == "xiaofeng" and pwd == "123456":
        print("用户登录成功！")
        break
    else:
        print('用户密码或用户名错误，请重新输入！')
print('结束运行')